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Thermal treatment and foaming of chars obtained from almond shells: kinetic study

机译：杏仁壳焦炭的热处理和发泡：动力学研究

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摘要

The influence of a combined thermal treatment on the density of chars obtained from almond shells has been investigated. The thermal treatment involves two steps at different heating rates: the first one up to temperatures of 225--400deg.C; and the second one up to 850deg.C. Thermogravimetric experiments have been carried out with the intermediate chars obtained after treatment revealing the evolution of the different fractions of the almond shells (i.e. hemicellulose, cellulose and lignin), and their influence on the final density of the chars. An intermediate treatment, where the gases evolved from the last remaining fractions of the cellulose coincide with the char in a fluid or soft state, is required to foam the particles. A kinetic model has been applied to quantify, with excellent results, the evolution of the different fractions.
机译：研究了组合热处理对杏仁壳焦炭密度的影响。热处理涉及两个步骤，分别采用不同的加热速率：第一步是达到225--400°C的温度;第二个温度高达850℃。已经对处理后获得的中间炭进行了热重实验，揭示了杏仁壳的不同部分（即半纤维素，纤维素和木质素）的演变及其对炭最终密度的影响。需要进行中间处理以使颗粒发泡，在中间处理中，从纤维素的最后剩余部分释放出的气体与处于液态或软状态的焦炭相吻合。动力学模型已被用于量化不同部分的演变，并获得了优异的结果。

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